Descaling blocking remover for high-temperature and high-pressure oil-gas well and preparation method of descaling blocking remover

A high-temperature, high-pressure, plugging-removing agent technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of exacerbating high-temperature and high-pressure wellbore corrosion, aggravating the possibility of sand production in formations, and inability to dissolve sulfate scale, etc., to achieve Improve oil and gas seepage channels, avoid formation rock strength reduction, and meet the effect of repeated plugging removal construction

Pending Publication Date: 2022-02-25
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using conventional acid liquid for plugging removal construction, the acid liquid will intensify the corrosion of the high temperature and high pressure wellbore while dissolving the blockage, and at the same time cause damage to the reservoir, reduce the strength of the formation rock, and even aggravate the possibility of sand production in the formation characteristics, seriously affecting the economic benefits of oilfield development
[0004] Moreover, this plugging removal method can only dissolve carbonate scale, but not sulfate scale. In addition, the plugging removal radius of conventional acid liquid is short, resulting in excessive dissolution near the wellbore and poor plugging removal effect in deep areas.

Method used

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  • Descaling blocking remover for high-temperature and high-pressure oil-gas well and preparation method of descaling blocking remover
  • Descaling blocking remover for high-temperature and high-pressure oil-gas well and preparation method of descaling blocking remover
  • Descaling blocking remover for high-temperature and high-pressure oil-gas well and preparation method of descaling blocking remover

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preparation example Construction

[0045] figure 1 It is a schematic flow chart of an embodiment of the preparation method of the descaling and plugging removal agent for high temperature and high pressure oil and gas wells of the present invention. Such as figure 1 Shown, the preparation method of the present embodiment comprises:

[0046] S101: adding metal chelating agent, clay stabilizer, drainage aid, demulsifier, and waterproof locking agent into water in sequence to obtain an intermediate system;

[0047] S102: Stir the intermediate system for at least 60 minutes to obtain a scale-removing and blocking-removing agent for high-temperature and high-pressure oil and gas wells.

[0048] When the descaling and plugging removal agent for high temperature and high pressure oil and gas wells to be prepared does not contain scale inhibitor, it can be carried out according to the above preparation method.

[0049] In the above preparation method, each component is sequentially added into water according to the ...

Embodiment 1

[0064] The descaling and plugging removal agent for high-temperature and high-pressure oil and gas wells of this embodiment includes the following components in terms of mass percentages:

[0065] Metal chelating agent: 8%

[0066] Antiscalant: 1%

[0067] Clay Stabilizer: 2%

[0068] Drainage aids: 2%

[0069] Demulsifier: 2%

[0070] Waterproof lock agent: 5%

[0071] The balance is clear water.

[0072] Wherein, the metal chelating agent includes according to mass percentage: 70% of aminocarboxylic acid chelating agent, 20% of hydroxycarboxylic acid chelating agent, and 10% of organic polyphosphonic acid chelating agent;

[0073] Specifically, aminocarboxylic acid chelating agents include ethylenediaminetetraacetic acid disodium salt (accounting for aminocarboxylic acid chelating agent mass percentage content is 30%), ethylenediaminetetraacetic acid tetrasodium salt (accounting for aminocarboxylic acid chelating agent mass percentage content is 30%), ethylenediaminetet...

Embodiment 2

[0084] The descaling and plugging removal agent for high-temperature and high-pressure oil and gas wells of this embodiment includes the following components in terms of mass percentages:

[0085] Metal chelating agent: 10%

[0086] Antiscalant: 2%

[0087] Clay Stabilizer: 1%

[0088] Drainage aids: 1%

[0089] Demulsifier: 0.5%

[0090] Waterproof lock agent: 10%

[0091] The balance is clear water.

[0092] Among them, the metal chelating agent includes according to the mass percentage: 60% of aminocarboxylic acid chelating agent, 25% of hydroxycarboxylic acid chelating agent, and 15% of organic polyphosphonic acid chelating agent;

[0093] Specifically, the aminocarboxylic acid chelating agent includes ethylenediaminetetraacetic acid disodium salt (accounting for 40% of the mass percentage of aminocarboxylic acid chelating agent), ethylenediaminetetraacetic acid tetrasodium salt (accounting for aminocarboxylic acid chelating agent mass percentage content is 40%), ethy...

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Abstract

The invention provides a descaling blocking remover for a high-temperature and high-pressure oil and gas well and a preparation method of the descaling blocking remover. The descaling blocking remover for the high-temperature and high-pressure oil-gas well comprises a metal chelating agent, a clay stabilizer, a discharge aiding agent, a demulsifying agent and a water blocking preventing agent. The descaling blocking remover disclosed by the invention is friendly to a shaft and a reservoir while realizing efficient blocking removal, and does not cause damage to the shaft and the reservoir.

Description

technical field [0001] The invention relates to a scale-removing and blocking-removing agent, in particular to a scale-removing and blocking-removing agent for high-temperature and high-pressure oil and gas wells and a preparation method thereof, belonging to the technical field of oil and gas production enhancement. Background technique [0002] With the intensification of exploration and development of high-temperature deep wells in the Tarim Oilfield, problems such as oilfield scaling and wellbore blockage have become increasingly prominent, which not only leads to the reduction of oil and gas seepage channels in oil and gas wells, but also makes reservoirs, wellbores, production tubing, ground equipment and Oil and gas gathering and transportation pipelines on the surface form sedimentation blockages. When the blockage reaches a certain level, oil and gas production will be greatly reduced, and even wells will be shut down, which will seriously hinder the stable productio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/528
CPCC09K8/528
Inventor 吴红军黄锟高文祥刘举张宝刘己全王茜张宏强陈兰张晖唐胜蓝孔嫦娥
Owner PETROCHINA CO LTD
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